Re: [Discuss-gnuradio] phase coherence for N210 and SBX

[Marcus D. Leech]

On 04/23/2015 06:23 PM, Pengyu Zhang wrote:
> Thanks for the inspiring tips. I did not use the WX GUI scope for 
> checking the phase offset. Instead, I log the baseband signal received 
> by each RX antenna. Then, I plot the IQ constellation of the received 
> baseband for checking their phase offset.
>
> Can you be a bit more specific when you say the "multi_usrp object" 
> and the "timed commands"? Are there tutorials that I can follow step 
> by step for using the two functions you mentioned? Your comments are 
> very helpful :)
A source/sink block in Gnu Radio uses an underlying multi_usrp object, 
so all you have to do is configure your source block for two channels, with
  two devices, and use

addr0=<first-device-ip-addr,addr1=<second-device-ip-addr>

In the device arguments.

Also, recent gr-uhd (3.7.6.1 and newer at least) use timed commands, so 
phase-zeroing will happen after a tune automatically, without you having
  to do anything.


The top of the UHD manual is here:

http://files.ettus.com/manual/page_devices.htmlhttp://files.ettus.com/manual/page_devices.html

The Doxygen docs are here:

http://files.ettus.com/manual/page_coding.html

The documents for gr-uhd are part of the Gnu Radio documentation:

http://gnuradio.org/doc/doxygen/classgr_1_1uhd_1_1usrp__source.html